race
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A race condition can occur between competing snippets, like snippets based on the same environment, or snippets that signal a winning strategy but can also stop executing.
race start;
Begins a race, passing an arbitrary amount of winners which, by default, is 1.
Yes
race stop;
Stops a race.
Yes
!# snippet, another, first, second
example.com#$#race start; snippet 1 2 3; other 4 5 6; another 7 8 9; race stop;
example.com#$#race start 2; first 1; second 2; third 3; fourth 4; race stop;
A snippet wins the race, and all others are flagged as losers. A registered callback to stop losing snippets from executing is then invoked.